fix(providers): `signIn` action should allow custom id for the Credentials provider

[aarondoet]

☕️ Reasoning

User should be able to define multiple credentials providers with unique id. This issue got partially fixed in #9471 but still exists in the SvelteKit framework.

🧢 Checklist

• [ ] Documentation
• [ ] Tests
• [ ] Ready to be merged

🎫 Affected issues

📌 Resources

• Security guidelines
• Contributing guidelines
• Code of conduct
• Contributing to Open Source

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Name	Status	Preview	Comments	Updated (UTC)
auth-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 4, 2024 9:07am

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
next-auth-docs	⬜️ Ignored (Inspect)	Visit Preview		Sep 4, 2024 9:07am

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